CN107703193B - Device and method for measuring moisture content in compost - Google Patents
Device and method for measuring moisture content in compost Download PDFInfo
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- CN107703193B CN107703193B CN201710892235.XA CN201710892235A CN107703193B CN 107703193 B CN107703193 B CN 107703193B CN 201710892235 A CN201710892235 A CN 201710892235A CN 107703193 B CN107703193 B CN 107703193B
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Abstract
The invention relates to the technical field of measuring instruments, and provides a device and a method for measuring moisture content in compost. The device comprises a processing chamber, an induction chamber and a guide head which are connected in sequence from top to bottom; a processing unit and a communication unit electrically connected with the processing unit are arranged in the processing chamber; the induction chamber is internally provided with a power supply unit and an induction unit positioned between the processing unit and the power supply unit; the induction unit comprises a shell, a first metal ring, a second metal ring, a control unit, an inductor and a temperature sensor chip, wherein the first metal ring and the second metal ring are sleeved on the outer wall of the shell at intervals, and the control unit, the inductor and the temperature sensor chip are arranged in the shell; two ends of the control unit are respectively and electrically connected with the power supply unit and the processing unit. The invention not only overcomes the influence of composting temperature and composting materials on the calculation result and ensures the accuracy of the calculation result, but also can effectively guide the working personnel to optimize the composting process, shorten the composting period and improve the composting quality.
Description
Technical Field
The invention relates to the technical field of measuring instruments, in particular to a device and a method for measuring moisture content in compost.
Background
China is a big agricultural country, and organic solid wastes such as annual livestock manure, crop straws and the like are huge in quantity, so that environmental pollution is easily caused, and potential safety hazards are brought. In recent years, high-temperature aerobic composting is widely applied at home and abroad due to the characteristics of simplicity, low cost, easy operation and the like, and becomes an important way for harmless and quantitative utilization of organic solid wastes.
Because the proper moisture content is a prerequisite for the growth of microorganisms, if the moisture content is too high, the flow resistance of oxygen is increased, the oxygen concentration in water is reduced, the activity of aerobic bacteria is further influenced, and even an anaerobic environment is generated, so that the quality of compost is greatly reduced; if the water content is too low, the compost material cannot be fermented. Therefore, the moisture content has a great influence on the aerobic fermentation process of the high-temperature aerobic compost. The real-time understanding of the moisture content in the compost is not only helpful for mastering the fermentation process and improving the fermentation efficiency, but also can assist in optimizing the process parameters and reducing the operation cost.
At present, the methods for measuring the moisture content in the compost mainly comprise a drying and weighing method and a measuring method based on dielectric characteristics. The drying and weighing method not only needs to destroy the stack body for sampling, but also can cause measurement errors because part of water is lost along with the rise of temperature in the drying process; the measurement method based on the dielectric characteristics does not take the influence of the composting temperature and the composting materials into consideration, so that when the composting temperature is high or the difference of the composting materials is large, the measurement result is deviated.
Disclosure of Invention
The invention aims to solve the technical problem that the measurement result is easy to deviate due to composting temperature or composting materials in the prior art.
In order to solve the problems, the invention provides a device for measuring the moisture content in compost, which comprises a treatment chamber, an induction chamber and a guide head which are sequentially connected from top to bottom;
a processing unit and a communication unit electrically connected with the processing unit are arranged in the processing chamber, and the communication unit is used for communicating between the processing unit and an upper computer;
a power supply unit and an induction unit positioned between the processing unit and the power supply unit are arranged in the induction chamber; the induction unit comprises a shell, a first metal ring and a second metal ring which are sleeved on the outer wall of the shell at intervals, and a control unit, an inductor and a temperature sensor chip which are arranged in the shell, wherein the first metal ring, the second metal ring, the inductor and the temperature sensor chip are all electrically connected with the control unit, and the first metal ring, the second metal ring and the inductor jointly form a resonance circuit; and two ends of the control unit are respectively and electrically connected with the power supply unit and the processing unit.
Wherein, the both ends of induction chamber respectively with the processing chamber with the first detachable connection of direction.
The processing chamber comprises a base connected with the induction chamber and an outer cover covering the base.
The processing unit comprises a microprocessor, and a real-time clock module, a storage module, a wireless radio frequency module, a power supply control module and an induction unit control module which are respectively and electrically connected with the microprocessor; the sensing unit control module is used for controlling the action of the control unit; the microprocessor is used for calculating the actual moisture content according to the temperature information and the resonant frequency acquired from the control unit; the real-time clock module is used for generating accurate system time; the storage module is used for storing the temperature information, the actual moisture content and the system time; the wireless radio frequency module is used for controlling the communication unit to receive the instruction sent by the upper computer and sending the temperature information and the actual moisture content to the upper computer; the power supply control module is used for controlling charging and discharging of the power supply unit.
The induction room comprises induction rooms, a processing unit, a power supply unit, a plurality of control units and a plurality of induction units, wherein the number of the induction units is multiple, the induction units are sequentially arranged along the height direction of the induction room, the control units at two ends of the induction room are respectively electrically connected with the processing unit and the power supply unit, and the adjacent two control units are electrically connected.
The two ends of each control unit are respectively and electrically connected with a first adapter plate and a second adapter plate, the first adapter plate is provided with a contact, and the second adapter plate is provided with a slot for inserting the contact.
The processing chamber and the adjacent shell, the two adjacent shells and the power supply unit and the adjacent shells are detachably connected through connecting pieces.
The connecting piece comprises a first connecting ring and a second connecting ring, a first internal thread and a second internal thread are respectively arranged at two ends of the inner wall of the first connecting ring, a first external thread matched and connected with the first internal thread is arranged on the outer wall of the second connecting ring, a third internal thread is arranged on the inner wall of the second connecting ring, a second external thread matched and connected with the second internal thread is arranged on the lower portion of the treatment chamber and each shell, and a third external thread matched and connected with the third internal thread is arranged on the upper portion of each power supply unit and each shell.
The present invention also provides a method for measuring the moisture content in compost, which comprises the steps of:
s1, acquiring a measurement mode instruction sent by the upper computer through the communication unit, and jumping to execute the step S2;
s2, judging whether the measurement mode command is a sequential measurement command, if so, executing a step S3, otherwise, executing a step S6;
s3, starting all the control units from top to bottom in sequence, wherein each control unit controls the corresponding resonance circuit to resonate and controls the corresponding temperature sensor chip to acquire compost temperature, sends resonance frequency and temperature information to the processing unit, and jumps to execute the step S4;
s4, calculating the actual moisture content of the compost at the corresponding depth according to the resonance frequency and the temperature information by the processing unit, and executing the step S5;
s5, sending the actual moisture content and the temperature information to an upper computer through a communication unit;
s6, judging whether each control unit is positioned at the designated compost depth one by one, if so, executing a step S7;
and S7, starting the control unit to control the corresponding resonant circuit to resonate and the corresponding temperature sensor chip to acquire the compost temperature, sending the resonant frequency and temperature information to the processing unit, and skipping to execute the step S4.
Wherein, the step S4 specifically includes:
moisture content before correction θV(T)：
θV(T)＝a*η(T)b(1)；
Wherein the content of the first and second substances,
a and b both represent coefficients, η (T) represents a normalization index, fa(T) represents the resonance frequency of the resonant circuit when the induction chamber is placed in air, fW(T) represents the resonant frequency of the resonant circuit when the induction chamber is placed in pure water; f. ofS(T) represents the resonant frequency of the resonant circuit when the induction chamber is placed in compost;
actual moisture content θC：
θC＝θV(T)+ψ(T) (3)；
Wherein ψ (T) is the moisture content θ before correctionVAnd (T) and the temperature information are training samples, and compensation quantity is obtained by using a least square support vector machine.
The compost temperature control device is simple in structure and convenient and fast to operate, the characteristic that the compost equivalent capacitance sensed by the variable capacitor formed by the first metal ring and the second metal ring changes along with the moisture content in compost and the compost temperature is utilized, the actual moisture content of the compost is calculated through the resonance frequency of the resonance circuit formed by the first metal ring, the second metal ring and the inductor and the compost temperature, the influence of the compost temperature and compost materials on the calculation result is overcome, the accuracy of the calculation result is ensured, the actual moisture content of the compost is obtained, the temperature of the compost can be obtained, and further, workers can be effectively guided to optimize the compost process, the compost period is shortened, and the compost quality is improved.
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for measuring the moisture content in compost according to example 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a sensing unit in an apparatus for measuring the moisture content in compost according to example 1 of the present invention;
FIG. 3 is a schematic view of a treating unit in an apparatus for measuring the moisture content in compost according to example 1 of the present invention;
FIG. 4 is a flow chart of a method for measuring the moisture content in compost according to example 2 of the present invention.
Reference numerals:
1. a processing chamber; 1-1, a communication unit; 1-2, a processing unit; 1-3 bases;
1-4, a housing; 2. an induction chamber; 2-11, a shell; 2-12, a control unit;
2-13, a first metal ring; 2-14, a second metal ring; 2-15, a first transfer plate;
2-16, a second adapter plate; 2-17, a second connecting ring; 2-18, a first connecting ring;
2-2, a power supply unit; 2-21, a battery housing; 2-22, a battery; 3. a guide head.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
It is to be understood that, unless otherwise expressly stated or limited, the term "coupled" is used in a generic sense as defined herein, e.g., fixedly attached or removably attached or integrally attached; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1 and 2, the invention provides a device for measuring moisture content in compost, which comprises a processing chamber 1, an induction chamber 2 and a guide head 3 which are connected in sequence from top to bottom;
a processing unit 1-2 and a communication unit 1-1 electrically connected with the processing unit 1-2 are arranged in the processing chamber 1, and the communication unit 1-1 is used for communication between the processing unit 1-2 and an upper computer; the communication unit 1-1 is preferably an antenna inserted in the processing chamber 1, i.e. the antenna is connected to the processing unit 1-2 at one end and protrudes out of the processing chamber 1 at the other end.
A power supply unit 2-2 and an induction unit positioned between the processing unit 1-2 and the power supply unit 2-2 are arranged in the induction chamber 2; the induction unit comprises a shell 2-11, a first metal ring 2-13 and a second metal ring 2-14 which are sleeved on the outer wall of the shell 2-11 at intervals, and a control unit 2-12, an inductor and a temperature sensor chip which are arranged in the shell 2-11, wherein the first metal ring 2-13, the second metal ring 2-14, the inductor and the temperature sensor chip are electrically connected with the control unit 2-12, and the first metal ring 2-13, the second metal ring 2-14 and the inductor jointly form a resonance circuit; two ends of the control unit 2-12 are respectively electrically connected with the power supply unit 2-2 and the processing unit 1-2.
During measurement: firstly, a worker sends an instruction to a communication unit 1-1 through an upper computer; then, the communication unit 1-1 sends the received instruction to the processing unit 1-2, and the processing unit 1-2 controls the induction unit to start, namely the control unit 2-12 controls the resonance circuit to resonate and controls the temperature sensor chip to acquire the compost temperature, and sends the resonance frequency and temperature information to the processing unit 1-2; then, the processing unit 1-2 calculates the actual moisture content theta of the compost according to the resonance frequency and the temperature informationCSpecifically:
actual moisture content of the compostC＝θV(T)+ψ(T)，
Wherein, thetaV(T)＝a*η(T)b，
θV(T) represents the moisture content before correction, and ψ (T) is the moisture content before correction θV(T) and temperature information as training samples, using least squares support directionThe compensation quantity obtained by the measuring machine, a and b both represent coefficients, η (T) represents normalized index, fa(T) represents the resonance frequency of the resonant circuit when the induction chamber 2 is placed in air; f. ofW(T) represents the resonance frequency of the resonant circuit when the induction chamber 2 is placed in pure water; f. ofW(T) represents the resonant frequency of the resonant circuit when the induction chamber 2 is placed in compost.
Because the dielectric constant of water is 81 and the dielectric constant of the compost material is 2-6, the water content in the compost and the compost material can directly influence the relative dielectric constant epsilon of the compost; in addition, due to
Wherein, VWDenotes the water volume coefficient, ∈W(T) represents a water dielectric constant at temperature T, VSRepresenting the volume coefficient of compost particles, epsilonSDenotes the dielectric constant, V, of the compost particlesaDenotes the air volume coefficient, ∈aWhich represents the dielectric constant of air, and therefore the relative dielectric constant epsilon of the compost is also related to the temperature of the compost. In addition, based on the fringe field effect of high-frequency electromagnetism, the first metal ring 2-13 and the second metal ring 2-14 can form a variable capacitor, and the variable capacitor senses the equivalent capacitance C of compostSProportional to the relative dielectric constant epsilon of the compost, i.e. CSK ∈ where k denotes the coefficient, that is to say the compost equivalent capacitance C perceived by the variable capacitorSThe water content in the compost and the temperature of the compost are changed. When the induction chamber 2 is placed in compost, the resonant frequency f of a resonant circuit formed by the first metal rings 2-13, the second metal rings 2-14 and the inductorS(T) compost equivalent capacitance C as perceived by the variable capacitorSVariations, in particular:
wherein L is0Representing an inductance; c0Represents a matching capacitance; cPRepresenting the sum of the parasitic capacitances of the control units 2-12 and the capacitance of the sensing chamber 2. It can be seen that the resonance isFrequency fS(T) is also varied depending on the moisture content of the compost and the temperature of the compost, and the actual moisture content theta of the obtained compost is calculatedCThe influence of the composting temperature and the composting materials on the composting can be overcome.
And finally, the processing unit 1-2 sends the actual water content and temperature information obtained through calculation to an upper computer through the communication unit 1-1.
Therefore, the method utilizes the characteristic that the equivalent capacitance of the compost sensed by the variable capacitor formed by the first metal ring 2-13 and the second metal ring 2-14 changes along with the moisture content in the compost and the temperature of the compost, and calculates the actual moisture content of the compost through the processing unit 1-2 according to the resonance frequency of the resonance circuit formed by the first metal ring 2-13, the second metal ring 2-14 and the inductor and the compost temperature, so that the method not only overcomes the influence of the compost temperature and compost materials on the calculation result and ensures the accuracy of the calculation result, but also can obtain the temperature of the compost while obtaining the actual moisture content of the compost, thereby effectively guiding workers to optimize the process, shortening the composting period and improving the composting quality.
Preferably, the first metal ring 2-13 and the second metal ring 2-14 are made of copper or stainless steel, and the induction chamber 2 is made of PVC. In addition, the top of the guide head 3 is tapered in order to reduce the resistance to the device being inserted in the compost.
Preferably, both ends of the induction chamber 2 are detachably connected with the processing chamber 1 and the guide head 3, respectively, for later maintenance and replacement. For example, both ends of the induction chamber 2 are provided with internal threads, and the processing chamber 1 and the guide head 3 are provided with external threads for matching connection with the internal threads.
Preferably, the process chamber 1 includes a base 1-3 connected to the induction chamber 2 and a cover 1-4 covering the base 1-3.
Preferably, the power supply unit 2-2 includes a battery case 2-21 and a battery 2-22 provided in the battery case 2-21.
Referring to fig. 3, the processing unit 1-2 includes a microprocessor, and a real-time clock module, a storage module, a radio frequency module, a power control module, and an induction unit control module electrically connected to the microprocessor, respectively; the sensing unit control module is used for controlling the actions of the control units 2-12; the microprocessor is used for calculating the actual moisture content according to the temperature information and the resonant frequency acquired from the control units 2-12; the real-time clock module is used for generating accurate system time; the storage module is used for storing temperature information, actual moisture content and system time; the wireless radio frequency module is used for controlling the communication unit 1-1 to receive an instruction sent by the upper computer and send temperature information and actual moisture content to the upper computer; the power supply control module is used for controlling charging and discharging of the power supply unit 2-2. The memory module is preferably a ferroelectric memory.
Preferably, the number of the sensing units is multiple, the multiple sensing units are sequentially arranged along the height direction of the sensing chamber 2, the control units 2-12 at two ends of the sensing chamber 2 are respectively and electrically connected with the processing unit 1-2 and the power supply unit 2-2, and two adjacent control units 2-12 are electrically connected. More preferably, the number of sensing units is not more than 8. Before the measurement, can be earlier with the device vertical interpolation establish in the compost, because a plurality of induction element set gradually along induction chamber 2 direction of height, consequently each induction element is arranged in the compost of the different degree of depth respectively, that is to say that the measuring result of every induction element is the one-to-one with the degree of depth of compost. Therefore, during measurement, a worker can control all the sensing units to sequentially measure from top to bottom through the processing units 1-2 and can control the sensing units at the specified depth of the compost to measure so as to know the moisture content and the temperature at different depths of the compost in real time.
Furthermore, two ends of each control unit 2-12 are respectively and electrically connected with a first adapter plate 2-15 and a second adapter plate 2-16, the first adapter plate 2-15 is provided with a contact, and the second adapter plate 2-16 is provided with a slot for inserting the contact. The advantages of such an arrangement are: on one hand, when the two sensing units are connected, a worker only needs to insert the contact on the first adapter plate 2-15 of one sensing unit into the slot of the second adapter plate 2-16 of the other sensing unit; on the other hand, when one of them induction element broke down, the staff only need with its both ends respectively follow the contact and the slot extract can that correspond to alleviateed staff's working strength greatly, improved work efficiency.
Preferably, in order to ensure that the control unit 2-12 and the processing unit 1-2, the control unit 2-12 and the power supply unit 2-2 and the two adjacent control units 2-12 have good contact when the device is plugged and unplugged, the processing chamber 1 and the adjacent housing 2-11, the two adjacent housings 2-11 and the power supply unit 2-2 and the adjacent housing 2-11 are detachably connected through connecting pieces.
Specifically, the connecting piece comprises a first connecting ring 2-18 and a second connecting ring 2-17, a first internal thread and a second internal thread are respectively arranged at two ends of the inner wall of the first connecting ring 2-18, a first external thread matched and connected with the first internal thread is arranged on the outer wall of the second connecting ring 2-17, a third internal thread is arranged on the inner wall of the second connecting ring 2-17, a second external thread matched and connected with the second internal thread is arranged at the lower part of the processing chamber 1 and each shell 2-11, and a third external thread matched and connected with the third internal thread is arranged at the upper parts of the power supply unit 2-2 and each shell 2-11.
Example 2
As shown in fig. 4, the present invention also provides a method for measuring moisture content in compost, the method comprising the steps of:
s1, acquiring a measurement mode instruction sent by the upper computer through the communication unit 1-1, and jumping to execute the step S2; the measurement mode command is a sequential measurement command or a specified measurement command. Wherein, the sequential measurement instruction means that the processing unit 1-2 controls all the induction units to start one by one, that is, all the control units 2-12 start up sequentially from top to bottom along the height direction of the induction chamber 2, each control unit 2-12 controls the corresponding resonance circuit to resonate and controls the corresponding temperature sensor chip to acquire the compost temperature, and sends the resonance frequency and the temperature information to the processing unit 1-2; if the measurement mode instruction is a specified measurement instruction, the processing unit 1-2 controls the induction unit at the specified depth of the compost to start, that is, the control unit 2-12 at the specified depth of the compost controls the corresponding resonance circuit to resonate and controls the corresponding temperature sensor chip to acquire the temperature of the compost, and sends the resonance frequency and the temperature information to the processing unit 1-2.
S2, judging whether the measurement mode command is a sequential measurement command, if so, executing a step S3, otherwise, executing a step S6;
s3, starting all the control units 2-12 from top to bottom in sequence, controlling the corresponding resonant circuit to resonate and the corresponding temperature sensor chip to acquire the compost temperature by each control unit 2-12, sending the resonant frequency and the temperature information to the processing unit 1-2, and skipping to execute the step S4;
s4, the processing unit 1-2 calculates the actual moisture content of the compost at the corresponding depth according to the resonance frequency and the temperature information, and the method specifically comprises the following steps:
moisture content before correction θV(T)：
θV(T)＝a*η(T)b(1)；
Wherein the content of the first and second substances,
a and b both represent coefficients, η (T) represents a normalization index, fa(T) represents the resonance frequency of the resonant circuit when the induction chamber 2 is placed in air, fW(T) represents the resonance frequency of the resonant circuit when the induction chamber 2 is placed in pure water; f. ofS(T) represents the resonant frequency of the resonant circuit when the induction chamber 2 is placed in compost;
actual moisture content θC：
θC＝θV(T)+ψ(T) (3)；
Wherein ψ (T) is a moisture content θ before correctionVAnd (T) and temperature information are training samples, and compensation quantities are obtained by using a least square support vector machine. Specifically, the compensation amount ψ (T) can be obtained using Matlab: first, the moisture content θ before correction is usedV(T) establishing a training sample set for input data of the training samples with the temperature information; then, selecting a radial basis function as a kernel function of a least square support vector machine; then, determining the optimal values of the normalization parameter gam and the kernel parameter sig2 by adopting a five-fold cross validation method so as to control the fitting error of the kernel function; next, using normalization parametersTraining the training sample set by using the number gam and the optimal value of the nuclear parameter sig2 to obtain a support vector machine model; finally, the moisture content θ is passed through the support vector machine modelV(T) and temperature information to obtain the compensation quantity thetaV(T)。
S5, sending the actual moisture content and temperature information to an upper computer through the communication unit 1-1;
s6, judging whether each control unit 2-12 is the control unit 2-12 positioned at the designated compost depth one by one, if so, executing a step S7;
s7, starting the control unit 2-12 to control the corresponding resonance circuit to resonate and control the corresponding temperature sensor chip to acquire the compost temperature, sending the resonance frequency and temperature information to the processing unit 1-2, and jumping to execute the step S4.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the invention, but not to limit it; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A device for measuring the moisture content in compost is characterized by comprising a treatment chamber, an induction chamber and a guide head which are sequentially connected from top to bottom;
a processing unit and a communication unit electrically connected with the processing unit are arranged in the processing chamber, and the communication unit is used for communicating between the processing unit and an upper computer;
a power supply unit and an induction unit positioned between the processing unit and the power supply unit are arranged in the induction chamber; the induction unit comprises a shell, a first metal ring and a second metal ring which are sleeved on the outer wall of the shell at intervals, and a control unit, an inductor and a temperature sensor chip which are arranged in the shell, wherein the first metal ring, the second metal ring, the inductor and the temperature sensor chip are all electrically connected with the control unit, and the first metal ring, the second metal ring and the inductor jointly form a resonance circuit; two ends of the control unit are respectively and electrically connected with the power supply unit and the processing unit;
the induction chamber is provided with a plurality of induction units, the induction units are sequentially arranged along the height direction of the induction chamber, the control units positioned at two ends of the induction chamber are respectively and electrically connected with the processing unit and the power supply unit, and two adjacent control units are electrically connected; the two ends of each control unit are respectively and electrically connected with a first adapter plate and a second adapter plate, the first adapter plate is provided with a contact, and the second adapter plate is provided with a slot for inserting the contact; the processing chamber and the adjacent shell, the two adjacent shells and the power supply unit and the adjacent shell are detachably connected through connecting pieces;
the connecting piece comprises a first connecting ring and a second connecting ring, wherein a first internal thread and a second internal thread are respectively arranged at two ends of the inner wall of the first connecting ring, a first external thread matched and connected with the first internal thread is arranged on the outer wall of the second connecting ring, a third internal thread is arranged on the inner wall of the second connecting ring, a second external thread matched and connected with the second internal thread is arranged on the lower portion of the shell of the treatment chamber and each of the treatment chamber, and a third external thread matched and connected with the third internal thread is arranged on the upper portion of the shell of the power supply unit and each of the treatment chamber.
2. The apparatus for measuring the moisture content of compost as claimed in claim 1, wherein said sensing chamber is removably connected at both ends to said treatment chamber and said guide head, respectively.
3. The apparatus of claim 1, wherein the treatment chamber comprises a base coupled to the sensing chamber and a housing disposed over the base.
4. The device for measuring the moisture content in compost according to claim 1, wherein said processing unit comprises a microprocessor and a real-time clock module, a storage module, a wireless radio frequency module, a power supply control module and a sensing unit control module which are respectively electrically connected with said microprocessor; the sensing unit control module is used for controlling the action of the control unit; the microprocessor is used for calculating the actual moisture content according to the temperature information and the resonant frequency acquired from the control unit; the real-time clock module is used for generating accurate system time; the storage module is used for storing the temperature information, the actual moisture content and the system time; the wireless radio frequency module is used for controlling the communication unit to receive the instruction sent by the upper computer and sending the temperature information and the actual moisture content to the upper computer; the power supply control module is used for controlling charging and discharging of the power supply unit.
5. A method for measuring the moisture content in compost, characterized in that it is based on the device for measuring the moisture content in compost according to claim 1, comprising the following steps:
s1, acquiring a measurement mode instruction sent by the upper computer through the communication unit, and jumping to execute the step S2;
s2, judging whether the measurement mode command is a sequential measurement command, if so, executing a step S3, otherwise, executing a step S6;
s3, starting all the control units from top to bottom in sequence, wherein each control unit controls the corresponding resonance circuit to resonate and controls the corresponding temperature sensor chip to acquire compost temperature, sends resonance frequency and temperature information to the processing unit, and jumps to execute the step S4;
s4, calculating the actual moisture content of the compost at the corresponding depth according to the resonance frequency and the temperature information by the processing unit, and executing the step S5;
s5, sending the actual moisture content and the temperature information to an upper computer through a communication unit;
s6, judging whether each control unit is positioned at the designated compost depth one by one, if so, executing a step S7;
and S7, starting the control unit to control the corresponding resonant circuit to resonate and the corresponding temperature sensor chip to acquire the compost temperature, sending the resonant frequency and temperature information to the processing unit, and skipping to execute the step S4.
6. The method for measuring the moisture content in compost according to claim 5, characterized in that said step S4 specifically comprises:
moisture content before correction θV(T)：
θV(T)＝a*η(T)b(1)；
Wherein the content of the first and second substances,
a and b both represent coefficients, η (T) represents a normalization index, fa(T) represents the resonance frequency of the resonant circuit when the induction chamber is placed in air, fW(T) represents the resonant frequency of the resonant circuit when the induction chamber is placed in pure water; f. ofS(T) represents the resonant frequency of the resonant circuit when the induction chamber is placed in compost;
actual moisture content θC：
θC＝θV(T)+ψ(T) (3)；
Wherein ψ (T) is the moisture content θ before correctionVAnd (T) and the temperature information are training samples, and compensation quantity is obtained by using a least square support vector machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892235.XA CN107703193B (en) | 2017-09-27 | 2017-09-27 | Device and method for measuring moisture content in compost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892235.XA CN107703193B (en) | 2017-09-27 | 2017-09-27 | Device and method for measuring moisture content in compost |
Publications (2)
| Publication Number | Publication Date |
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| CN107703193A CN107703193A (en) | 2018-02-16 |
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| US5397994A (en) * | 1993-12-28 | 1995-03-14 | Alkon Corporation | Moisture measurement gauge for particulates including a transmission line forming part of a resonant circuit |
| CN102565150A (en) * | 2012-01-13 | 2012-07-11 | 北京盈胜泰科技术有限公司 | Detection device and monitoring system for soil relative humidity and soil fertility change |
| US9146206B2 (en) * | 2012-02-03 | 2015-09-29 | Deere & Company | Capacitance-based moisture sensor |
| CN202649158U (en) * | 2012-06-06 | 2013-01-02 | 河南中原光电测控技术有限公司 | Insertion-pipe-type soil moisture and temperature sensor |
| CN105758901B (en) * | 2016-02-25 | 2018-11-30 | 南京农业大学 | Agricultural land soil vertical section moisture measuring method and device |
| CN205808985U (en) * | 2016-04-28 | 2016-12-14 | 浙江托普云农科技股份有限公司 | A kind of Novel integrated soil temperature-moisture sensor |
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